Disk cutter.



Patented Np-v. 25, I901.

y BROOKS.

DISK CUTTER.

(Application filed Apr. 7, i902.) (No Mbdel.)

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UNITED STATES PATENT OFFICE.

JOHN BROOKS, OF BROOKTON, MASSACHUSETTS.

DISK CUTTER.

SPECIFICATION forming part of Letters Patent N 0. 714,359, datedNovember 25, 1902.

Application filed April 7, 1902. Serial No. 101,799. (No model.)

To all whom it rnaly concern:

Be itknown that I, JOHN BROOKS, of Brockton, in the county of Plymouthand State of Massachusettaihave invented certain new and usefulImprovements in Disk Cutters, of which the following. is aspecification.

This invention. relates to cutters such as those used in leather-skivingmachines, and

particularly in the so -called Amazeen skiver, the cutter being a diskof metal flat on one side and beveled at its marginal portion on theother, the intersection of the fiat and beveled sides forming a circularcutting edge. continuous-that is to say, forming an uninterrupted circlearound the entire periphery of the disk. It has been found that acontinuous cutting edge leaves something to be desired in point ofrapidity of operation, the cutting action being undesirably'slow. It hasbeen proposed to remedy this objection ,by forming radial grooves orcorrugations in the flat side of the cutter, the corrugations extendingto and through the cutting edge and interrupting its continuity, leavingsaid edge somewhat serrated. While this formation increases the rapidityof the cutting action, it causes a further objection-namely, creation ofdust, its action being to tear or rake from the material a large numberof small particles, which are scattered by the ro- 'tation of thecutter.

My invention has for its object to overcome each of the objections abovereferred to; and to this end it consists in a disk cutter having in itsflat side a series of grooves which are tangentially arranged--that isto say, at a tangent to a circle within the periphery of the cutter-saidgrooves extending to and through the cutting edge and interrupting thecontinuity of the latter, the angle at which the outer portions of thegrooves therevention.

Fig. 4 represents an enlarged side view of a This cutting edge hasusually been section on line 5 5 of Fig. 4.

The same reference characters indicate the same parts in all thefigures.

In the drawings, a represents a disk cutter, which is substantially fiaton one side and is beveled at the marginal portion of its opposite side,the beveled portion intersecting the fiat side and forming a circularcutting edge, this being the ordinary-form of disk cutter employed in anAmazeenskiving-machine.

In carrying out my invention I form in the flat side of the cutter aseries of shallow and narrow grooves b, which are arranged tangentiallywith relation to an imaginary circle withinand concentric with thecircular cutting edge of the cutter. These grooves extend to and throughthe cutting edge andare of such depth that they do not extend throughthe body or thicker portion of the cutter, but only through the cuttingedge and the reduced portion immediately adjacent thereto, as indicatedin Figs. 4 and 5. The grooves interrupt the continuity of the cuttingedges sufficiently to increase the rapidity of the cutting action, theirtangential arrangement enabling one side of each groove to form an acuteangle 2 and the other side an obtuse angle 3 relatively to the peripheryof the cutter. When the cutter is in operation, it is rotated in thedirection indicated by the arrows, the direction being such that theacute angles 2 follow, while the obtuse angles 3 lead, the adjacentparts ofithe cutting edge.

This arrangement prevents any liability of I prefer to provide thecutter with circular orifices o c at the inner ends of the grooves b,said orifices extending through the body of the cutter and serving toprevent cracks which may form in the cutter extending along the groovesb from continuing inwardly from the said orifices. I have found that theorifices formed and arranged as shown effectually prevent the inwardextension of any cracks that may develop along the grooves b.

In practice the side which I have hereinbefore referred to as the flatside is slightly concave, the degree of concavity being so slight,however, that it is hardly perceptible.

I claim 1. A disk cutter having at one side a beveled marginal portionintersecting the opposite side to form a circular cutting edge, and aseries of grooves formed in the opposite side and extending to thecutting edge, the depth of the grooves being less than the thickness ofthe cutter, excepting at the marginal portion thereof, so that the outerportions of the grooves extend through the cutter and form slotsinterrupting the continuity of the cutting edge, the continuity of thebeveled portion Within said slots being uninterrupted.

2. A disk cutter having a beveled marginal portion on one side forming acutting edge, and a series of tangential grooves formed in the oppositeside, said grooves extending to the cutting edge and interrupting thecontinuity of the same, the cutter having a series of orificescommunicating with the inner ends of the grooves.

In testimony whereof I have affixed my signature in presence of twoWitnesses.

JOHN BROOKS.

Witnesses:

O. F. BROWN, E. BATOHELDER.

